MESON Chess Problem Database

Problem Display
PID: 170144 (8/5Q2/7r/4k3/1P4R1/5P2/1q1NK2p/B7 w - - 0 1)

Burri, Rene

Tages-Anzeiger, 1982

8/5Q2/7r/4k3/1P4R1/5P2/1q1NK2p/B7

#2

7 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa1
      • 2.Sc4#
    • 1...Qc3
      • 2.Sc4#
    • 1...Qd4
      • 2.Sc4#
    • 1...Rd6
      • 2.Re4#
  • Tries
    • 1.Rg5+?
      • 1...Kd4
        • 2.Bxb2#
        • 2.Qc4#
      • 1...Kd6!
    • 1.f4+?
      • 1...Kd4
        • 2.Bxb2#
        • 2.Qc4#
      • 1...Kd6!
  • Keys
    • 1.Rd4!
      • threat
        • 2.Rd5#
      • 1...Qxd2+
        • 2.Rxd2#
      • 1...Kxd4
        • 2.Bxb2#
      • 1...Qxd4
        • 2.Sc4#
      • 1...Rf6
        • 2.Qd5#
      • 1...Rd6
        • 2.Re4#
      • 1...Re6
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(a);N_PINS(B),N_SPINQ(a),XB(A)::S(B)
    • Q(a);N_PINS(B)::S(B)
    • R(d);SBLOCK::R1(F)
  • Tries
    • Try
      • R(F);CHECK
      • Refutation
        • K(c);N_SPINQ(a),S_FLIGHT
    • Try
      • P(D);CHECK
      • Refutation
        • K(c);N_SPINQ(a),S_FLIGHT
  • Actual
    • R(F);N_PINQ(a)
    • Threat
      • R1(F)
    • Vars
      • Q(a);CHECK,OGATE,XS(B)::B(A)+R(F),XQ(a)
      • K(c);OGATEB,P_SPINQ(a),S_FLIGHT,XR(F)::B(A),XQ(a)
      • Q(a);N_PINS(B),P_SPINQ(a),XR(F)::S(B)
      • R(d);SBLOCK::QAR1(G)
      • R(d);SBLOCK::R1(F)
      • R(d);SBLOCK::QAB1(G)
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